Existing main feeds for SANS Internet Storm Center: inetstormcenter and inetstormcenter.
New feed of newsbites feature: sans_newsbites. More of an overview than a daily update. Details:
"SANS NewsBites [...]weekly [..]exec summary [...]most important news articles [..]published on computer security during the last week. Each news item is very briefly summarized and includes a reference on the web for detailed information, if possible. Spend five minutes per week to keep up with [...]latest security news. New issues are [...]every Wednesday. "
I also added another feed (possibly of narrower interest...), a whitehat website feed (actually of their low traffic mailing list): happyhacker_org.